大约有 3,000 项符合查询结果（耗时：0.0157秒） [XML]
PostgreSQL: How to make “case-insensitive” query
... in all languages. (Maybe not even in
most languages.) Not every lowercase letter has a corresponding
uppercase letter; not every uppercase letter has a corresponding
lowercase letter.
Using functions like lower() and upper() will give you a sequential
scan. It can't use indexes. On my test system, ...
How to check if a model has a certain column/attribute?
...s checking my models for ones that had a user, but had to instead look for user_id since some models delegated user.
– MattyB
Jul 22 '15 at 16:16
...
Django - filtering on foreign key properties
...
student_user = User.objects.get(id=user_id)
available_subjects = Subject.objects.exclude(subject_grade__student__user=student_user) # My ans
enrolled_subjects = SubjectGrade.objects.filter(student__user=student_user)
context.update({'available_subjects': avail...
C++ multiline string literal
...titute \n for the terminating space on each quoted string fragment. C++11 raw literals are still my favorite.
– emsr
Sep 22 '11 at 3:46
3
...
Download large file in python with requests
...
It's much easier if you use Response.raw and shutil.copyfileobj():
import requests
import shutil
def download_file(url):
local_filename = url.split('/')[-1]
with requests.get(url, stream=True) as r:
with open(local_filename, 'wb') as f:
...
Python: print a generator expression?
...ckets around it. So yeah, you can do
>>> list((x for x in string.letters if x in (y for y in "BigMan on campus")))
But you can just as well do
>>> [x for x in string.letters if x in (y for y in "BigMan on campus")]
Yes, that will turn the generator expression into a list comp...
Installation error: INSTALL_PARSE_FAILED_MANIFEST_MALFORMED?
...
I was having this error because i had capital letters in my package name like this
Com.Example.packagename
after i had changed it to something like
com.example.packagename
it was solved
sha...
Rails has_many with alias name
...
Give this a shot:
has_many :jobs, foreign_key: "user_id", class_name: "Task"
Note, that :as is used for polymorphic associations.
share
|
improve this answer
|...
Hide html horizontal but not vertical scrollbar
... of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English. Many desktop publishing packages and web page editors now use Lorem Ipsum as their default model text, and a search for 'lorem i...
How to use Comparator in Java to sort
...arable vs Comparator
Sorting an ArrayList of Contacts
Also, do not use raw types in new code. Raw types are unsafe, and it's provided only for compatibility.
That is, instead of this:
ArrayList peps = new ArrayList(); // BAD!!! No generic safety!
you should've used the typesafe generic decla...